67 lines
2.2 KiB
TypeScript
67 lines
2.2 KiB
TypeScript
//// [arrayFrom.ts]
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// Tests fix for #20432, ensures Array.from accepts all valid inputs
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// Also tests for #19682
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interface A {
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a: string;
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}
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interface B {
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b: string;
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}
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const inputA: A[] = [];
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const inputB: B[] = [];
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const inputALike: ArrayLike<A> = { length: 0 };
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const inputARand = getEither(inputA, inputALike);
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const result1: A[] = Array.from(inputA);
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const result2: A[] = Array.from(inputA.values());
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const result3: B[] = Array.from(inputA.values()); // expect error
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const result4: A[] = Array.from(inputB, ({ b }): A => ({ a: b }));
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const result5: A[] = Array.from(inputALike);
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const result6: B[] = Array.from(inputALike); // expect error
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const result7: B[] = Array.from(inputALike, ({ a }): B => ({ b: a }));
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const result8: A[] = Array.from(inputARand);
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const result9: B[] = Array.from(inputARand, ({ a }): B => ({ b: a }));
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// if this is written inline, the compiler seems to infer
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// the ?: as always taking the false branch, narrowing to ArrayLike<T>,
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// even when the type is written as : Iterable<T>|ArrayLike<T>
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function getEither<T> (in1: Iterable<T>, in2: ArrayLike<T>) {
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return Math.random() > 0.5 ? in1 : in2;
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}
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//// [arrayFrom.js]
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// Tests fix for #20432, ensures Array.from accepts all valid inputs
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// Also tests for #19682
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var inputA = [];
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var inputB = [];
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var inputALike = { length: 0 };
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var inputARand = getEither(inputA, inputALike);
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var result1 = Array.from(inputA);
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var result2 = Array.from(inputA.values());
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var result3 = Array.from(inputA.values()); // expect error
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var result4 = Array.from(inputB, function (_a) {
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var b = _a.b;
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return ({ a: b });
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});
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var result5 = Array.from(inputALike);
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var result6 = Array.from(inputALike); // expect error
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var result7 = Array.from(inputALike, function (_a) {
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var a = _a.a;
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return ({ b: a });
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});
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var result8 = Array.from(inputARand);
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var result9 = Array.from(inputARand, function (_a) {
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var a = _a.a;
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return ({ b: a });
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});
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// if this is written inline, the compiler seems to infer
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// the ?: as always taking the false branch, narrowing to ArrayLike<T>,
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// even when the type is written as : Iterable<T>|ArrayLike<T>
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function getEither(in1, in2) {
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return Math.random() > 0.5 ? in1 : in2;
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}
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